I am looking for liquids or substances that turn black when heated. I know anything can be burned, but i want something that would turn black on a controlled bases.

 

or perhaps something that would turn black due to the reaction of positve or negative charges?

Coffee?

 

What you are asking for fate sounds like a liquid crystal display, or LCD screen. They are clear until you pass a current through them, at which point they become opaque. So it is a controlable change.

I am looking for liquids or substances that turn black when heated. I know anything can be burned' date=' but i want something that would turn black on a controlled bases.

or perhaps something that would turn black due to the reaction of positve or negative charges?[/quote']Do mean 'turn black' in the sense of changing from a surface that reflects some light to one that reflects none?

 

Or do you mean a substance (liquid?) that allows light to pass through it, but under certain conditions blocks light?

 

You can accomplish the latter mechanically with polarized filter orientations.

what i am actually looking for a a clear liquid that will turn black when appravated by apositive or a negative charge.

 

does that make any sense?

The latest technology is 'carbon TV':

 

Carbon TV

 

New liquids are being patented all the time and can probably be bought:

 

New liquid crystal display

i am not really looking for something with electricity going continuos more something that can be made permenent after this reaction...maybe a liquid coating that drys up, and reacts some how and turns black....

 

how about a suspension of Silver Chloride?